Insiders also reveal the unlikely lovebirds simply can’t wait to make things official with a May-December marriage.
Songwriter and producer David is 68, while former American Idol runner-up Katharine is only 34.
As fans know, he was coming off a very high-profile divorce from Real Housewives of Beverly Hills star Yolanda Hadid when they met last year.
But the snitch tells Radar that their age difference is now a non-factor in their relationship!
“She doesn’t even notice how old he is,” the source said. “They are totally in sync with each other and of one mind.”
Now, the songbird is telling pals family is the first priority on their future agenda together!
“She’s aching to be a mom, and David’s finally on board after a lot of thought and consideration,” according to the source. “He has five daughters and several stepchildren already, but he’s got to understand when you marry a woman Katharine’s age, kids are part of the deal.”
Added the insider: “Katharine wouldn’t mind eloping so she can focus on getting pregnant.”
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